SUS304 generally refers to 304 stainless steel, which is a common material in stainless steel with a density of 7.93 g/cm _; Also known as 18/8 stainless steel in the industry, it means that it contains more than 18% of chromium and more than 8% of nickel; High temperature resistance of 800℃, good processability and high toughness, widely used in industry, furniture decoration industry and food and medical industry. However, it should be noted that the content index of food grade 304 stainless steel is stricter than that of ordinary 304 stainless steel. For example, the international definition of 304 stainless steel is that it mainly contains chromium 18%-20% and nickel 8%- 10%, but food-grade 304 stainless steel contains chromium 18% and nickel 8%, which is allowed to fluctuate within a certain range and limits the content of various heavy metals. In other words, 304 stainless steel is not necessarily food grade 304 stainless steel.